PISA Calculator

Calculate Proximal Isovelocity Surface Area for valve regurgitation assessment.

Hemodynamic Parameters

PISA Radius

Aliasing Velocity (Va)

cm/s

Peak Regurgitant Velocity

cm/s

Regurgitant VTI (Optional)

Regurgitation Analysis

Flow Rate161mL/s

EROA Area0.32cm²

Regurg. Volume48mL

Quantification derived from the hemispherical flow convergence zone.

Overview

The PISA (Proximal Isovelocity Surface Area) method is used in echocardiography to quantify the severity of valvular regurgitation. By observing the flow convergence zone where blood accelerates towards the orifice, clinicians can calculate the regurgitant flow and the Effective Regurgitant Orifice Area (EROA).

💡

Pro Tips

Adjust the Nyquist limit so the PISA radius is manageable (typically 0.5 - 1.0 cm).
Higher aliasing velocities result in smaller radii; lower aliasing velocities results in larger radii.
If multiple measurements are taken, use the one that shows the cleanest hemispherical flow convergence.

Fun Facts

"PISA works best for central, circular regurgitant orifices."
"A PISA radius is obtained by shifting the color Doppler baseline towards the direction of the jet."
"The method is used for Mitral, Aortic, and Tricuspid regurgitation."
"VTI (Velocity Time Integral) measures the distance the blood travels during the regurgitant phase."

Formula: Flow = 2 * PI * Radius² * Aliasing velocity. EROA = Flow / Peak Velocity. RVol = EROA * VTI.

Used with this

Similar tools that might be useful

A-a Gradient

Calculate the alveolar-arterial oxygen gradient to assess lung function.

ABSI (A Body Shape Index)

Assess mortality risk based on waist circumference, height, and BMI.

ACFT Calculator (Army Combat Fitness Test)

Calculate your score for the new US Army fitness test (Age/Gender normed).

PISA Calculator

Calculate Proximal Isovelocity Surface Area for valve regurgitation assessment.

Hemodynamic Parameters

PISA Radius

Aliasing Velocity (Va)

cm/s

Peak Regurgitant Velocity

cm/s

Regurgitant VTI (Optional)

Regurgitation Analysis

Flow Rate161mL/s

EROA Area0.32cm²

Regurg. Volume48mL

Quantification derived from the hemispherical flow convergence zone.

Overview

💡

Pro Tips

Adjust the Nyquist limit so the PISA radius is manageable (typically 0.5 - 1.0 cm).
Higher aliasing velocities result in smaller radii; lower aliasing velocities results in larger radii.
If multiple measurements are taken, use the one that shows the cleanest hemispherical flow convergence.

Fun Facts

"PISA works best for central, circular regurgitant orifices."
"A PISA radius is obtained by shifting the color Doppler baseline towards the direction of the jet."
"The method is used for Mitral, Aortic, and Tricuspid regurgitation."
"VTI (Velocity Time Integral) measures the distance the blood travels during the regurgitant phase."

Formula: Flow = 2 * PI * Radius² * Aliasing velocity. EROA = Flow / Peak Velocity. RVol = EROA * VTI.

Used with this

Similar tools that might be useful

A-a Gradient

Calculate the alveolar-arterial oxygen gradient to assess lung function.

ABSI (A Body Shape Index)

Assess mortality risk based on waist circumference, height, and BMI.

ACFT Calculator (Army Combat Fitness Test)

Calculate your score for the new US Army fitness test (Age/Gender normed).